feat: allow CLI to be ESM

[snitin315]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

No

Motivation / Use-Case

Same as webpack/webpack#17088

Breaking Changes

None

Additional Info

No

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.29 🎉

Comparison is base (53bb4d7) 91.99% compared to head (c5a025c) 92.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4837      +/-   ##
==========================================
+ Coverage   91.99%   92.28%   +0.29%     
==========================================
  Files          16       16              
  Lines        1673     1673              
  Branches      625      625              
==========================================
+ Hits         1539     1544       +5     
+ Misses        123      118       -5     
  Partials       11       11              

see 2 files with indirect coverage changes

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